<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	  <script type="text/javascript">
	  	var num = 75;
	  	if (num >= 90 && num < 100) {
	  		console.log("A");
	  	} else if(num >= 80 && num < 90){
	  	  console.log("B");
	  	}else if(num >= 70 && num < 80){
	  	  console.log("C");
	  	}else if(num >= 60 && num < 70){
	  		console.log("D")
	  	}else if(num >= 0 && num < 60){
	  	  console.log("E");
	  	}
	  </script>
	</body>
</html>
